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Short-Term Investments (Tables) | 9 Months Ended
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Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of amortized costs, gross unrealized gains and losses, and fair values of investments | ​
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September 30, 2025 | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
(in thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
U.S. treasury securities | $ | 177,388 | ​ | $ | 171 | ​ | $ | — | ​ | $ | 177,559
Total short-term marketable securities | $ | 177,388 | ​ | $ | 171 | ​ | $ | — | ​ | $ | 177,559
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December 31, 2024 | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
(in thousands) | Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
U.S. treasury securities | $ | 132,615 | ​ | $ | 167 | ​ | $ | — | ​ | $ | 132,782
Total short-term marketable securities | $ | 132,615 | ​ | $ | 167 | ​ | $ | — | ​ | $ | 132,782

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